// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2011 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "main.h"

#define VERIFY_THROWS_BADALLOC(a)                                                                                      \
	{                                                                                                                  \
		bool threw = false;                                                                                            \
		try {                                                                                                          \
			a;                                                                                                         \
		} catch (std::bad_alloc&) {                                                                                    \
			threw = true;                                                                                              \
		}                                                                                                              \
		VERIFY(threw && "should have thrown bad_alloc: " #a);                                                          \
	}

template<typename MatrixType>
void
triggerMatrixBadAlloc(Index rows, Index cols)
{
	VERIFY_THROWS_BADALLOC(MatrixType m(rows, cols));
	VERIFY_THROWS_BADALLOC(MatrixType m; m.resize(rows, cols));
	VERIFY_THROWS_BADALLOC(MatrixType m; m.conservativeResize(rows, cols));
}

template<typename VectorType>
void
triggerVectorBadAlloc(Index size)
{
	VERIFY_THROWS_BADALLOC(VectorType v(size));
	VERIFY_THROWS_BADALLOC(VectorType v; v.resize(size));
	VERIFY_THROWS_BADALLOC(VectorType v; v.conservativeResize(size));
}

EIGEN_DECLARE_TEST(sizeoverflow)
{
	// there are 2 levels of overflow checking. first in PlainObjectBase.h we check for overflow in rows*cols
	// computations. this is tested in tests of the form times_itself_gives_0 * times_itself_gives_0 Then in Memory.h we
	// check for overflow in size * sizeof(T) computations. this is tested in tests of the form times_4_gives_0 *
	// sizeof(float)

	size_t times_itself_gives_0 = size_t(1) << (8 * sizeof(Index) / 2);
	VERIFY(times_itself_gives_0 * times_itself_gives_0 == 0);

	size_t times_4_gives_0 = size_t(1) << (8 * sizeof(Index) - 2);
	VERIFY(times_4_gives_0 * 4 == 0);

	size_t times_8_gives_0 = size_t(1) << (8 * sizeof(Index) - 3);
	VERIFY(times_8_gives_0 * 8 == 0);

	triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0, times_itself_gives_0);
	triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0 / 4, times_itself_gives_0);
	triggerMatrixBadAlloc<MatrixXf>(times_4_gives_0, 1);

	triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0, times_itself_gives_0);
	triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0 / 8, times_itself_gives_0);
	triggerMatrixBadAlloc<MatrixXd>(times_8_gives_0, 1);

	triggerVectorBadAlloc<VectorXf>(times_4_gives_0);

	triggerVectorBadAlloc<VectorXd>(times_8_gives_0);
}
